Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 76
isation being the planeto which the vibrations are all perpendicular. In thiscase the plane of polarisation is the horizontal plane. The polarisation of light was first observed byBartholinus in 1670. He found that a ray of light whenpassed through a crystal of Iceland spar was split upinto two… … Fig. 42. brightness, and the relative brightness varies as thesecond crystal is rotated. In two positions of the secondcrystal two of the rays disappear completely, so thatthere is in these positions no subdivision of the rays bythe second crystal. Perhaps the easiest way in whichto observe this is…
Light
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